diff --git a/helpers/debug.sh b/helpers/debug.sh
index 43e2101..c63c3c3 100644
--- a/helpers/debug.sh
+++ b/helpers/debug.sh
@@ -1,26 +1,3 @@
 #!/usr/bin/env bash
 source $( dirname $(readlink -e -- "${BASH_SOURCE}"))/io.sh || exit 255
 
-########################################################
-# Functions to debug scripts
-########################################################
-
-var_dump() {
-    debug "$1 = ${!1}"
-}
-
-print_stacktrace() {
-    STACK=""
-    local i
-    local stack_size=${#FUNCNAME[@]}
-    debug "Callstack:"
-    # for (( i=$stack_size-1; i>=1; i-- )); do
-    for (( i=1; i<$stack_size; i++ )); do
-        local func="${FUNCNAME[$i]}"
-        [ x$func = x ] && func=MAIN
-        local linen="${BASH_LINENO[$(( i - 1 ))]}"
-        local src="${BASH_SOURCE[$i]}"
-        [ x"$src" = x ] && src=non_file_source
-        debug "   at $func $src:$linen"
-    done
-}
diff --git a/helpers/io.sh b/helpers/io.sh
index 063b866..724dadb 100644
--- a/helpers/io.sh
+++ b/helpers/io.sh
@@ -7,93 +7,132 @@
 which tput > /dev/null 2>&1 && [[ $(tput -T$TERM colors) -gt 8 ]] && CAN_USE_COLORS=1 || CAN_USE_COLORS=0
 USE_COLORS=${USE_COLORS:-$CAN_USE_COLORS}
 
-[ $USE_COLORS = 1 ] && IINFO="( i )" || IINFO=''
-[ $USE_COLORS = 1 ] && INOTE="( * )" || INOTE=''
-[ $USE_COLORS = 1 ] && IWARN="( # )" || IWARN=''
-[ $USE_COLORS = 1 ] && IERROR="( ! )" || IERROR=''
-[ $USE_COLORS = 1 ] && IFATAL="( @ )" || IFATAL=''
-[ $USE_COLORS = 1 ] && ISUCCESS="( ! )" || ISUCCESS=''
-[ $USE_COLORS = 1 ] && IASK="( ? )" || IASK=''
-[ $USE_COLORS = 1 ] && IDEBUG="(DBG)" || IDEBUG=''
-[ $USE_COLORS = 1 ] && IVRB="( + )" || IVRB=''
+# Icons (message prefixes)
+[[ "$USE_COLORS" == 1 ]] && IINFO="( i )"    || IINFO=''
+[[ "$USE_COLORS" == 1 ]] && INOTE="( * )"    || INOTE=''
+[[ "$USE_COLORS" == 1 ]] && IWARN="( # )"    || IWARN=''
+[[ "$USE_COLORS" == 1 ]] && IERROR="( ! )"   || IERROR=''
+[[ "$USE_COLORS" == 1 ]] && IFATAL="( @ )"   || IFATAL=''
+[[ "$USE_COLORS" == 1 ]] && ISUCCESS="( ! )" || ISUCCESS=''
+[[ "$USE_COLORS" == 1 ]] && IASK="( ? )"     || IASK=''
+[[ "$USE_COLORS" == 1 ]] && IDEBUG="(DBG)"   || IDEBUG=''
+[[ "$USE_COLORS" == 1 ]] && IVRB="( + )"     || IVRB=''
 
-[ $USE_COLORS = 1 ] && BOLD="\e[1m" || BOLD=''
-[ $USE_COLORS = 1 ] && DIM="\e[2m" || DIM=''
-[ $USE_COLORS = 1 ] && NOTBOLD="\e[22m" || NOTBOLD='' # sometimes \e[21m
-[ $USE_COLORS = 1 ] && NOTDIM="\e[22m" || NOTDIM=''
-[ $USE_COLORS = 1 ] && NORMAL="\e[20m" || NORMAL=''
-[ $USE_COLORS = 1 ] && RESET="\e[0m" || RESET=''
+# Text attributes
+[[ "$USE_COLORS" == 1 ]] && FRESET="$(tput sgr0)"   || FRESET=''   # Normal
+[[ "$USE_COLORS" == 1 ]] && FBOLD="$(tput bold)"    || FBOLD=''    # Bold
+[[ "$USE_COLORS" == 1 ]] && FDIM="$(tput dim)"      || FDIM=''     # Dimmed
+[[ "$USE_COLORS" == 1 ]] && FLINE="$(tput smul)"    || FLINE=''    # Underlined
+[[ "$USE_COLORS" == 1 ]] && FENDLINE="$(tput rmul)" || FENDLINE='' # End of underlined
+[[ "$USE_COLORS" == 1 ]] && FBLINK="$(tput blink)"  || FBLINK=''   # Blink
+[[ "$USE_COLORS" == 1 ]] && FREV="$(tput rev)"      || FREV=''     # Reversed
 
-[ $USE_COLORS = 1 ] && FRESET="\e[39m" || FRESET=''
-[ $USE_COLORS = 1 ] && FBLACK="\e[30m" || FBLACK=''
-[ $USE_COLORS = 1 ] && FWHITE="\e[97m" || FWHITE=''
-[ $USE_COLORS = 1 ] && FRED="\e[31m" || FRED=''
-[ $USE_COLORS = 1 ] && FGREEN="\e[32m" || FGREEN=''
-[ $USE_COLORS = 1 ] && FYELLOW="\e[33m" || FYELLOW=''
-[ $USE_COLORS = 1 ] && FBLUE="\e[34m" || FBLUE=''
-[ $USE_COLORS = 1 ] && FLRED="\e[91m" || FLRED=''
-[ $USE_COLORS = 1 ] && FLGREEN="\e[92m" || FLGREEN=''
-[ $USE_COLORS = 1 ] && FLYELLOW="\e[93m" || FLYELLOW=''
-[ $USE_COLORS = 1 ] && FLBLUE="\e[94m" || FLBLUE=''
+# Text colors - normal
+[[ "$USE_COLORS" == 1 ]] && FBLACK="$(tput setaf 0)"  || FBLACK=''  # Black
+[[ "$USE_COLORS" == 1 ]] && FRED="$(tput setaf 1)"    || FRED=''    # Red
+[[ "$USE_COLORS" == 1 ]] && FGREEN="$(tput setaf 2)"  || FGREEN=''  # Green
+[[ "$USE_COLORS" == 1 ]] && FYELLOW="$(tput setaf 3)" || FYELLOW='' # Yellow
+[[ "$USE_COLORS" == 1 ]] && FBLUE="$(tput setaf 4)"   || FBLUE=''   # Blue
+[[ "$USE_COLORS" == 1 ]] && FPURPLE="$(tput setaf 5)" || FPURPLE='' # Purple
+[[ "$USE_COLORS" == 1 ]] && FCYAN="$(tput setaf 6)"   || FCYAN=''   # Cyan
+[[ "$USE_COLORS" == 1 ]] && FWHITE="$(tput setaf 7)"  || FWHITE=''  # White
 
-[ $USE_COLORS = 1 ] && BRESET="\e[49m" || BRESET=''
-[ $USE_COLORS = 1 ] && BBLACK="\e[40m" || BBLACK=''
-[ $USE_COLORS = 1 ] && BWHITE="\e[107m" || BWHITE=''
-[ $USE_COLORS = 1 ] && BRED="\e[41m" || BRED=''
-[ $USE_COLORS = 1 ] && BGREEN="\e[42m" || BGREEN=''
-[ $USE_COLORS = 1 ] && BYELLOW="\e[43m" || BYELLOW=''
-[ $USE_COLORS = 1 ] && BBLUE="\e[44m" || BBLUE=''
-[ $USE_COLORS = 1 ] && BLRED="\e[101m" || BLRED=''
-[ $USE_COLORS = 1 ] && BLGREEN="\e[102m" || BLGREEN=''
-[ $USE_COLORS = 1 ] && BLYELLOW="\e[103m" || BLYELLOW=''
-[ $USE_COLORS = 1 ] && BLBLUE="\e[104m" || BLBLUE=''
+# Text colors - bright
+[[ "$USE_COLORS" == 1 ]] && FLBLACK="$(tput setaf 8)"   || FLBLACK=''  # Black
+[[ "$USE_COLORS" == 1 ]] && FLRED="$(tput setaf 9)"     || FLRED=''    # Red
+[[ "$USE_COLORS" == 1 ]] && FLGREEN="$(tput setaf 10)"  || FLGREEN=''  # Green
+[[ "$USE_COLORS" == 1 ]] && FLYELLOW="$(tput setaf 11)" || FLYELLOW='' # Yellow
+[[ "$USE_COLORS" == 1 ]] && FLBLUE="$(tput setaf 12)"   || FLBLUE=''   # Blue
+[[ "$USE_COLORS" == 1 ]] && FLPURPLE="$(tput setaf 13)" || FLPURPLE='' # Purple
+[[ "$USE_COLORS" == 1 ]] && FLCYAN="$(tput setaf 14)"   || FLCYAN=''   # Cyan
+[[ "$USE_COLORS" == 1 ]] && FLWHITE="$(tput setaf 15)"  || FLWHITE=''  # White
 
-dt() {
+# Background colors - normal
+[[ "$USE_COLORS" == 1 ]] && FBBLACK="$(tput setab 0)"   || FBBLACK=''  # Black
+[[ "$USE_COLORS" == 1 ]] && FBRED="$(tput setab 1)"     || FBRED=''    # Red
+[[ "$USE_COLORS" == 1 ]] && FBGREEN="$(tput setab 2)"   || FBGREEN=''  # Green
+[[ "$USE_COLORS" == 1 ]] && FBYELLOW="$(tput setab 3)"  || FBYELLOW='' # Yellow
+[[ "$USE_COLORS" == 1 ]] && FBBLUE="$(tput setab 4)"    || FBBLUE=''   # Blue
+[[ "$USE_COLORS" == 1 ]] && FBPURPLE="$(tput setab 5)"  || FBPURPLE='' # Purple
+[[ "$USE_COLORS" == 1 ]] && FBCYAN="$(tput setab 6)"    || FBCYAN=''   # Cyan
+[[ "$USE_COLORS" == 1 ]] && FBWHITE="$(tput setab 7)"   || FBWHITE=''  # White
+
+# Background colors - bright
+[[ "$USE_COLORS" == 1 ]] && FBLBLACK="$(tput setab 8)"   || FBLBLACK=''  # Black
+[[ "$USE_COLORS" == 1 ]] && FBLRED="$(tput setab 9)"     || FBLRED=''    # Red
+[[ "$USE_COLORS" == 1 ]] && FBLGREEN="$(tput setab 10)"  || FBLGREEN=''  # Green
+[[ "$USE_COLORS" == 1 ]] && FBLYELLOW="$(tput setab 11)" || FBLYELLOW='' # Yellow
+[[ "$USE_COLORS" == 1 ]] && FBLBLUE="$(tput setab 12)"   || FBLBLUE=''   # Blue
+[[ "$USE_COLORS" == 1 ]] && FBLPURPLE="$(tput setab 13)" || FBLPURPLE='' # Purple
+[[ "$USE_COLORS" == 1 ]] && FBLCYAN="$(tput setab 14)"   || FBLCYAN=''   # Cyan
+[[ "$USE_COLORS" == 1 ]] && FBLWHITE="$(tput setab 15)"  || FBLWHITE=''  # White
+
+now() {
     echo "[$(date +'%H:%M:%S')] "
 }
 
 ask() {
-    IFS= read -rp "$(print ${BOLD}${BBLUE}${FWHITE}${IASK}${BRESET}\ ${BOLD}$1 ): " $2
+    IFS= read -rp "$(print ${FBOLD}${FBBLUE}${FWHITE}${IASK}${FRESET}\ ${FBOLD}$1 ): " $2
 }
 
 print() {
-    echo -e "$*${RESET}"
+    echo -e "$*${FRESET}"
 }
 
 debug() {
     if [ "$2" ]; then
-        print "${DIM}${BOLD}${RESET}${DIM}$(dt)${IDEBUG} ${FUNCNAME[1]:-?}():${BASH_LINENO:-?}\t$1 " >&2
+        print "${FDIM}${FBOLD}${FRESET}${FDIM}$(now)${IDEBUG} ${FUNCNAME[1]:-?}():${BASH_LINENO:-?}\t$1 " >&2
     else
-        print "${DIM}${BOLD}${RESET}${DIM}$(dt)${IDEBUG} $1 " >&2
+        print "${FDIM}${FBOLD}${FRESET}${FDIM}$(now)${IDEBUG} $1 " >&2
     fi
 }
 
+var_dump() {
+    debug "$1 = ${!1}"
+}
+
+print_stacktrace() {
+    STACK=""
+    local i
+    local stack_size=${#FUNCNAME[@]}
+    debug "Callstack:"
+    # for (( i=$stack_size-1; i>=1; i-- )); do
+    for (( i=1; i<$stack_size; i++ )); do
+        local func="${FUNCNAME[$i]}"
+        [ x$func = x ] && func=MAIN
+        local linen="${BASH_LINENO[$(( i - 1 ))]}"
+        local src="${BASH_SOURCE[$i]}"
+        [ x"$src" = x ] && src=non_file_source
+        debug "   at $func $src:$linen"
+    done
+}
+
 verbose() {
-    print "${BOLD}$(dt)${IVRB}${RESET}${FYELLOW} $1 "
+    print "${FBOLD}$(now)${IVRB}${FRESET}${FYELLOW} $1 "
 }
 
 info() {
-    print "${BOLD}$(dt)${FWHITE}${BLBLUE}${IINFO}${RESET}${FWHITE} $1 "
+    print "${FBOLD}$(now)${FWHITE}${FBLBLUE}${IINFO}${FRESET}${FWHITE} $1 "
 }
 
 note() {
-    print "${BOLD}$(dt)${DIM}${FWHITE}${INOTE}${RESET} $1 "
+    print "${FBOLD}$(now)${FDIM}${FWHITE}${INOTE}${FRESET} $1 "
 }
 
 success() {
-    print "${BOLD}$(dt)${BGREEN}${FWHITE}${ISUCCESS}${BRESET}$FGREEN $1 "
+    print "${FBOLD}$(now)${FBGREEN}${FWHITE}${ISUCCESS}${FRESET}$FGREEN $1 "
 }
 
 warn() {
-    print "${BOLD}$(dt)${BYELLOW}${FBLACK}${IWARN}${BRESET}${FYELLOW} Warning:${RESET} $1 "
+    print "${FBOLD}$(now)${FBYELLOW}${FBLACK}${IWARN}${FRESET}${FYELLOW} Warning:${FRESET} $1 "
 }
 
 error() {
-    print "${BOLD}$(dt)${BLRED}${FWHITE}${IERROR} Error: ${BRESET}${FLRED} $1 " >&2
+    print "${FBOLD}$(now)${FBLRED}${FWHITE}${IERROR} Error: ${FRESET}${FLRED} $1 " >&2
 }
 
 fatal() {
-    print "${BOLD}$(dt)${BRED}${FWHITE}${IFATAL} FATAL: $1 " >&2
+    print "${FBOLD}$(now)${FBRED}${FWHITE}${IFATAL} FATAL: $1 " >&2
     print_stacktrace
 }
 
@@ -102,24 +141,24 @@ die() {
     exit ${2:-255}
 }
 
-# var='test var_dump'
-# var_dump var
-# debug 'test debug'
-# verbose 'test verbose'
-# info 'test info'
-# note 'test note'
-# success 'test success'
-# warn 'test warn'
-# error 'test error'
-# fatal 'test fatal'
-# die 'test die'
+var='test var_dump'
+var_dump var
+debug 'test debug'
+verbose 'test verbose'
+info 'test info'
+note 'test note'
+success 'test success'
+warn 'test warn'
+error 'test error'
+fatal 'test fatal'
+die 'test die'
 
 # experiments ==============================================================================
 
 # https://unix.stackexchange.com/a/269085
 # https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit
 # https://linuxcommand.org/lc3_adv_tput.php
-# https://gist.github.com/dtmilano/4055d6df5b6e4ea87c5a72dc2d604193
+# https://gist.github.com/nowmilano/4055d6df5b6e4ea87c5a72dc2d604193
 # https://gist.github.com/nick3499/402a6d7dccd474f2bdb679f4311b1238
 # https://gist.github.com/connorjan/2b02126868157c2b69f9aa0a052cdc86
 
@@ -143,53 +182,6 @@ die() {
 
 # ===========
 
-# Text color - normal
-# fgblack="$(tput setaf 0)"       # Black
-# fgred="$(tput setaf 1)"         # Red
-# fggreen="$(tput setaf 2)"       # Green
-# fgyellow="$(tput setaf 3)"      # Yellow
-# fgblue="$(tput setaf 4)"        # Blue
-# fgpurple="$(tput setaf 5)"      # Purple
-# fgcyan="$(tput setaf 6)"        # Cyan
-# fgwhite="$(tput setaf 7)"       # White
-
-# # Text color - bright
-# bfgblack="$(tput setaf 8)"      # Black
-# bfgred="$(tput setaf 9)"        # Red
-# bfggreen="$(tput setaf 10)"     # Green
-# bfgyellow="$(tput setaf 11)"    # Yellow
-# bfgblue="$(tput setaf 12)"      # Blue
-# bfgpurple="$(tput setaf 13)"    # Purple
-# bfgcyan="$(tput setaf 14)"      # Cyan
-# bfgwhite="$(tput setaf 15)"     # White
-
-# # Background color - normal
-# bgblack="$(tput setab 0)"       # Black - Background
-# bgred="$(tput setab 1)"         # Red
-# bggreen="$(tput setab 2)"       # Green
-# bgyellow="$(tput setab 3)"      # Yellow
-# bgblue="$(tput setab 4)"        # Blue
-# bgpurple="$(tput setab 5)"      # Purple
-# bgcyan="$(tput setab 6)"        # Cyan
-# bgwhite="$(tput setab 7)"       # White
-
-# # Background color - bright
-# bbgblack="$(tput setab 8)"      # Black - Background - Bright
-# bbgred="$(tput setab 9)"        # Red
-# bbggreen="$(tput setab 10)"     # Green
-# bbgyellow="$(tput setab 11)"    # Yellow
-# bbgblue="$(tput setab 12)"      # Blue
-# bbgpurple="$(tput setab 13)"    # Purple
-# bbgcyan="$(tput setab 14)"      # Cyan
-# bbgwhite="$(tput setab 15)"     # White
-
-# # Other attributes
-# normal="$(tput sgr0)"           # text reset
-# bold="$(tput bold)"             # make bold
-# underline="$(tput smul)"        # underline
-# nounderlin="$(tput rmul)"       # remove underline
-# mkblink="$(tput blink)"         # make blink
-# reverse="$(tput rev)"           # reverse
 
 # ===========